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Finding the Fourth Proportional to 939.38, 1,408.13 and 452.16

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Solution

The fourth proportional to 939.38, 1,408.13 and 452.16 is: 677.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.38 : 1,408.13 = 452.16 : x
  2. Step 2: Convert to fraction form
    939.38/1,408.13 = 452.16/x
  3. Step 3: Cross multiply
    939.38x = 1,408.13 × 452.16
  4. Step 4: Simplify right side
    939.38x = 636,697.80
  5. Step 5: Solve for x
    x = 636,697.80/939.38
  6. Step 6: Final answer
    x = 677.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.